PHP在线压缩文件夹并下载

使用环境为php7.3

     function createZip($openFile,$zipObj,$sourceAbso,$newRelat = '')
        {
            while(($file = readdir($openFile)) != false)
            {
                if($file=="." || $file=="..")
                    continue;

                /*源目录路径(绝对路径)*/
                $sourceTemp = $sourceAbso.'/'.$file;
                /*目标目录路径(相对路径)*/
                $newTemp = $newRelat==''?$file:$newRelat.'/'.$file;
                if(is_dir($sourceTemp))
                {
                    //echo '创建'.$newTemp.'文件夹<br/>';
                    $zipObj->addEmptyDir($newTemp);/*这里注意：php只需传递一个文件夹名称路径即可*/
                    createZip(opendir($sourceTemp),$zipObj,$sourceTemp,$newTemp);
                }
                if(is_file($sourceTemp))
                {
                    //echo '创建'.$newTemp.'文件<br/>';
                    $zipObj->addFile($sourceTemp,$newTemp);
                }
            }
        }


//创建<span style="font-family: Arial, Helvetica, sans-serif;">ZipArchive对象</span>
        $exportPath= $_SERVER['DOCUMENT_ROOT'].'/json';
        $filename=$exportPath.'.zip';
        $zip = new ipArchive();
//参数1:zip保存路径，参数2：ZIPARCHIVE::CREATE没有即是创建
        if(!$zip->open($filename,IPARCHIVE::CREATE))
        {
            echo "创建[exportPath.zip]失败<br/>";return;
        }
//echo "创建[$exportPath.zip]成功<br/>";
        createZip(opendir($exportPath),$zip,$exportPath);
        $zip->close();

        header("Cache-Control: public");
        header("Content-Description: File Transfer");
        header('Content-disposition: attachment; filename='.basename($filename)); //文件名
        header("Content-Type: application/zip"); //zip格式的
        header("Content-Transfer-Encoding: binary"); //告诉浏览器，这是二进制文件
        header('Content-Length: '. filesize($filename)); //告诉浏览器，文件大小
        @readfile($filename);